[SI-LIST] Re: Long trace open on the both ends
- From: "Nagaraju Nerella" <nagaraju.nerella@xxxxxxxxxxxx>
- To: <Ravinder.Ajmani@xxxxxxxxxxxxxx>, "SI-List" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 7 Jun 2006 11:47:08 +0530
Hi,
If the trace is open at both ends and even it is not connected, any part
of the circuit this can be used for the tuning purpose at high frequency
applications. Or could be antenna.
1) if the operating frequency of the signal is very high frequency then
there is chance of coupling and also the spacing between your circuit
trace and the open trace will decide the how much is the coupling.
It is better I can say if you provide the details on the circuit.
Thanks & Regards,
Nagaraju
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Ravinder.Ajmani@xxxxxxxxxxxxxx
Sent: Wednesday, June 07, 2006 12:25 AM
To: SI-List
Subject: [SI-LIST] Long trace open on the both ends
Hi SI Experts,
We have an existing design in which I have been asked to study the=20
possibility of depopulating a part of the circuit (for cost reasons).
This=20
will leave a trace about 6" long, open at both ends. The trace is part
of=20
the analog circuit, and there are no high-speed signals near the trace.
My=20
main concern is that since the trace is adjacent to the Power plane, it=20
will pick up noise and then radiate it at its resonant frequency with=20
unpredictable results. Even if I terminate it at the two ends, it may=20
only alter the frequency of resonance. I would like to know:
1) Will there be any noise/EMI issue if I leave the trace as is.
2) What will happen if the trace is shielded, and
3) Will it help if I add pads for resistors to terminate the trace at
both=20
ends.
4) Is there any possibility of simulating the trace behavior.
I will really appreciate the feedback.
Regards, Ravinder
Server PCB Development
Hitachi Global Storage Technologies
Email: Ravinder.Ajmani@xxxxxxxxxxxxxx
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